Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48130fc4bb34fe5…

MALICIOUS

PDF

137.2 KB Created: 2021-06-13 23:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7f2ed3ac7d73a59517fc6860681ee72d SHA-1: 0e070ce9ab2c51611a47acd02c980399a189c4a3 SHA-256: c48130fc4bb34fe52a0c5b6f22429ce11dcfed5821d5efcd2ae76ead00a21b07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=somewhere+over+the+rainbow+piano+sheet PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607757e61104b---51540967664.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/13382931771.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097927fa96e4---99994601557.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42818360a4---karagiw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/riik8k2pm7kdlnb3e9jnvdpcu1/zubakukimareterap.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ukkap0i760rjbop5pr43f9ibs1/88004625887.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f410785416---mododaraf.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b06967d4---35462096482.pdfIn PDF document text
    • http://citra.cl/userfiles/file/werujeruvujewurijepizamos.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/puijfibl9ke5dgiga02hkncjkn/wudemekiwaxuvexuwozi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/59ae96245a446aa98d942683ae9e47eb/padigimizixadunixenunipu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9a3907bf6a9518cf73065abe4dde7af7/91303510464.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3de56f65b25984558f832ff86dd291f/midulataboz.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/nekudasi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9d3ab53e644d5acd9b250e66d13d92f8/satesenofevusaxafeto.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e71273050e168a01b27c52e1917b8f56/nuwufupenok.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8550d03d---puwofunijuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B77B 4724 bytes
SHA-256: efa5eaaf31bc6e2d094e631b022ee2e8ebcc736b44dbd420dda892475ba05115
font_01_sfnt_off0001c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C83D 5420 bytes
SHA-256: 0a4cfa67cb9875642d205cd491a16db6d02424c51b0da25edb5d4aa01daef9d5
font_02_sfnt_off0001da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA87 2140 bytes
SHA-256: a9240b8a5579a1aa26c325df6c3b34322e4550d6f6afc12ce09b721e17b7e51a
font_03_sfnt_off0001e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E46F 17360 bytes
SHA-256: bcf767260cf29d83950ba1b94ad81a9ae677db4250dfa5d61ec86e9df0196d98

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